Ionic Equilibrium PYQs Set 4 (PDF)

Set 4 of 8 · Questions 91-120 of 233

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Mere Teacher · Previous Year Questions NEET Chemistry · Ionic Equilibrium · Set 4 (Q91-120)
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91. $At 25^{\circ} C, the solubility product of MCl is 1 \times 10^{- 10} . What is its molar solubility in 0.1 MNaCl solution at same temperature?$ (1) $0.1 M$ (2) $0.05 M$ (3) $10^{- 9} M$ (4) $10^{- 5} M$ 92. $The pH of a 0.1 molar solution of the acid HQ is 3. The value of the ionization constant, K_{a} of the acid is :$ (1) $3 \times 1 0^{-1}$ (2) $1 \times 1 0^{-3}$ (3) $1 \times 1 0^{-5}$ (4) $1 \times 1 0^{-7}$ 93. $The buffer system which helps to maintain the pH of blood between 7.26 to 7.42 , is$ (1) $H_{2} CO_{3} / HCO_{3}^{-}$ (2) $NH_{4} OH / NH_{4} Cl$ (3) $CH_{3} COOH / CH_{3} COO^{-}$ (4) $CH_{3} COONH_{4}$ 94. $Identify base_{2} for following equation according to Bronsted-Lowry theory HCl_{(aq)} + H_{2} O_{(l)} ⇌ H_{3} O_{(aq)}^{+} + Cl_{(aq)}^{-}$ (1) $H_{3} O_{(aq)}^{+}$ (2) $H_{2} O_{(l)}$ (3) $Cl_{(aq)}^{-}$ (4) $HCl_{(aq)}$ 95. $In which of the following, the solubility of AgCl will be minimum?$ (1) $0.1 M KNO_{3}$ (2) $0.1 MKCl$ (3) $0.2 M KNO_{3}$ (4) $Water$ 96. $Conjugate acid and conjugate base of HCO_{3}^{-} are respectively$ (1) $H_{2} CO_{3}, H_{3} CO_{3}^{+}$ (2) $H_{2} CO_{3}, CO_{3}^{2 -}$ (3) $CO_{3}^{2 -}, H_{2} CO_{3}$ (4) $CO_{3}^{2 -}, CO_{2}$ 97. $At 298 K the molar solubility of Cd (OH)_{2} in 0.1 MKOH solution is x \times 10^{- y} . The values of x and y are respectively (at 298 K, K_{sp} of (Cd (OH)_{2} = 2.5 \times 10^{- 14})$ (1) $2.5, 14$ (2) $25,13$ (3) $25,14$ (4) $2.5, 16$ 98. $At 25^{\circ} C, the ionisation constant for anilinium hydroxide is 5.00 \times 10^{- 10} . The hydrolysis constant of anilinium chloride is$ (1) $2.00 \times 10^{- 5}$ (2) $4.00 \times 10^{- 3}$ (3) $1.50 \times 10^{- 6}$ (4) $2.50 \times 10^{- 4}$ 99. $pH of water is 7 at 25^{\circ} C . If water is heated to 80^{\circ} C ., it's pH will:$ (1) $Decrease$ (2) $H^{+} concentration increases, OH^{-} concentration decreases$ (3) $Remains the same$ (4) $Increase$ 100. $A buffer solution is prepared by mixing 0.2 M sodium acetate and 0.1 M acetic acid. If p K_{a} for acetic acid is 4.7. Find the pH .$ (1) $3.0$ (2) $4.0$ (3) $5.0$ (4) $2.0$ 101. $In liquid‐gas equilibrium, the pressure of vapours above the liquid is constant at$ (1) $constant temperature$ (2) $low temperature$ (3) $high temperature$ (4) $none of these.$ 102. $Observe the following equilibrium at T (K) H_{2} (g) + I_{2} (g) ⇌ 2 HI (g) Which one of the following does not disturb the above equilibrium?$ (1) $Addition of H_{2} (g)$ (2) $Removal of HI (g)$ (3) $Addition of I_{2} (g)$ (4) $Addition of He (g)$ 103. $Which of the following fluoro‐compounds is most likely to behave as a Lewis base?$ (1) $B F_{3}$ (2) $P F_{3}$ (3) $C F_{4}$ (4) $S i F_{4}$ 104. $If the molar concentrations of base and its conjugate acid are same, then pOH of the buffer solution is$ (1) $same as p K_{b} of base$ (2) $same as p K_{a} of base$ (3) $same as p K_{a} of acid$ (4) $same as p K_{b} of acid$ 105. $Zirconium phosphate [Z r_{3} (P O_{4})_{4}] dissociates into three zirconium cations of charge +4 and four phosphate anions of charge -3. If molar solubility of zirconium phosphate is denoted by S and its solubility product by K_{s p} then which of the following relationship between S and K_{s p} is correct?$ (1) $S = {K_{s p} / (6912)^{1/7}}$ (2) $S = {K_{s p} /144}^{1/7}$ (3) $S = (K_{s p} /6912)^{1/7}$ (4) $S = {K_{s p} /6912}^{7}$ 106. $Consider a weak base ' B ' of pK_{b} = 5.699 .^{’} x^{’} mL of 0.02 M HCl and ' y ' mL of 0.02 M weak base ' B ' are mixed to make 100 mL of a buffer of pH 9 at 25^{\circ} C . The values of ' x' and ' y' respectively are: [Given: log 2 = 0.3010, log 3 = 0.4771, log 5 = 0.699]$ (1) $x y 85.7 14.3$ (2) $x y 14.3 85.7$ (3) $x y 11.1 88.9$ (4) $x y 42.7 57.3$ 107. $Which of the following expression is correct$ (1) $Δ G = - RT ln K$ (2) $Δ G = \frac{1}{R T ^{2} ln K}$ (3) $Δ G^{0} = - RT ln K$ (4) $Δ G^{0} = - \frac{1}{R T ^{2} ln K}$ 108. $30.0 mL of the given HCl solution requires 20.0 mL of 0.1 M sodium carbonate solution for complete neutralisation. What is the volume of this HCl solution required to neutralise 30.0 mL of 0.2 MNaOH solution?$ (1) $25 mL$ (2) $50 mL$ (3) $90 mL$ (4) $45 mL$ 109. $Equimolar solutions of the following substances were prepared separately. Which one of these will record the highest p H value?$ (1) $B a C l_{2}$ (2) $A l C l_{3}$ (3) $L i C l$ (4) $B e C l_{2}$ 110. $At 780 K and 10 atmosphere pressure the equilibrium constant for the reaction 2 A (g) ⇌ B (g) + C (g) is 3.52 . At the same temperature and 7.04 atmosphere pressure, the equilibrium constant for the same reaction is$ (1) $7.04$ (2) $3.52$ (3) $10.56$ (4) $5.23$ 111. $Which of the following salts is the most basic in aqueous solution?$ (1) $F e C l_{3}$ (2) $Pb (C H_{3} C O O)_{2}$ (3) $Al (C N)_{3}$ (4) $C H_{3} COOK$ 112. $A gas is allowed to expand in an insulated container against a constant external pressure of 2.5 bar from 4.5 dm^{3} to 7 \times 10^{- 3} m^{3} . What is the change in internal energy of the gas?$ (1) $- 3.25 J$ (2) $- 312.5 J$ (3) $112.3 J$ (4) $- 625 J$ 113. $The pH of a & 0.02 & & M & & NH_{4} C solution will be [given K_{b} (NH_{4} OH) = 10^{- 5} and log 2 = 0.301]$ (1) $2.65$ (2) $4.35$ (3) $4.65$ (4) $5.35$ 114. $For the equilibrium 2 H_{2} O ⇌ H_{3} O^{+} + OH^{-} the value of Δ G^{\circ} 298 K is approximately:$ (1) $100 kJ mol^{- 1}$ (2) $- 80 kJ mol^{- 1}$ (3) $80 kJ mol^{- 1}$ (4) $- 100 kJ mol^{- 1}$ 115. $Given below are two statements : Statement (I) : A Buffer solution is the mixture of a salt and an acid or a base mixed in any particular quantities. Statement (II) : Blood is naturally occurring buffer solution whose pH is maintained by H_{2} CO_{3} / HCO_{3}^{-} Θ concentrations. In the light of the above statements, choose the correct answer from the options given below :$ (1) $Statement I is true but Statement II is false$ (2) $Both Statement I and Statement II are true$ (3) $Statement I is false but Statement II is true$ (4) $Both Statement I and Statement II are false$ 116. $3 O_{2} (g) ⇌ 2 O_{3} (g) for the given reaction at 298 K, K_{c} is found to be 3.0 \times 10^{- 59} . If the concentration of O_{2} at equilibrium is 0.040 M then concentration of O_{3} in M is$ (1) $1.2 \times 10^{21}$ (2) $4.38 \times 10^{- 32}$ (3) $1.9 \times 10^{- 63}$ (4) $2.4 \times 10^{31}$ 117. $A weak acid HX at 25ºC has the dissociation constant 1 \times 1 0^{-5} . It forms a salt NaX on reaction with caustic soda. The percentage hydrolysis of 0.1 M solution of NaX is :$ (1) $0.0001%$ (2) $0.01 %$ (3) $0.1 %$ (4) $0.15 %$ 118. $In which of the following salts, only cationic hydrolysis is involved?$ (1) $CH_{3} COONH_{4}$ (2) $CH_{3} COONa$ (3) $NH_{4} Cl$ (4) $Na_{2} SO_{4}$ 119. $A mixture of 100 m mol of Ca (O H)_{2} and 2 g of sodium sulphate was dissolved in water and the volume was made up to 100 mL. The mass of calcium sulphate formed and the concentration of O H^{-} in resulting solution, respectively, are : (Molar mass of Ca (O H)_{2}, N a_{2} S O_{4} and C a S O_{4} are 74, 143 and 136 g m o l^{-1}, respectively; K_{s p} of Ca (O H)_{2} is 5.5 \times 1 0^{-6})$ (1) $13.6 g, 0.14 mol L^{-1}$ (2) $13.6 g, 0.28 mol L^{-1}$ (3) $1.9 g, 0.28 mol L^{-1}$ (4) $1.9 g, 0.14 mol L^{-1}$ 120. $The solubility of Mg (O H)_{2} is s moles/liter. The solubility product under the same condition is :$ (1) $4 s^{3}$ (2) $3 s^{4}$ (3) $4 s^{2}$ (4) $s^{3}$